Chain stitch sewing machine of the zigzag type



feb. 17, 1931. F. Ear-:RT 1,792,578

CHAIN STITCHYXSEWING IIACHINE OF THE ZIGZAG TYPE Filed Jan. 17. 1930 4 Sheets-Sheet l a T. A l I N a i.

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' i l l f- I g L S l Q x v e I f l 4 Sheets-Sheet 2 F.. EBERT CHAIN STITCH SEWING MACHINE OF THE ZIGZAG TYPE Filed Jan. 1'7, 1950 Feb. 17, 1931.

Feb. 17, 1931. F, EBERT 1,792,578

CHAIN STITCH SEWING MACHINE OF THE ZIGZAG TYPE Filed Jan. 17, 1950 4 Sheets-Sheet 3 lll 721, ve nzlaf:

Feb. 17, 1931. F. EBERT 1,792,578

CHAIN STITCH SEWING MACHINE 0F THE ZIGZAG TYPE Filed Jan. 1'7. 1930 4 Sheets-Sheet 4 Patented Pelli. 17, 1931 Y Y UNITEDl STATE-s PATENT OFFICE FRITZ EBEBT, lE OBERNDORF-ON-THE-NEGKAR, GERMANY CHAIN STITCH SEWING M ACHINE OF THE ZIGZAG '.IYPIE` Application filed January 17, '1930, Serial No. 421,540, and in Germany January 16, 1929.

The present invention relates to a chain bers 1, 2 is of known type and not described in stitch sewing machine of the zigzag type. detail. Y

In sewingmachines of this class the needle l The lateral dlSPlCeHleH 0f the needle l and the 'looper are continuallyv adjusted to aIld'lOOper 2 isbrought about by a cam groove 5 and fro laterally during sewing to insure both 3 already known to serve for this purpose and 55 the proper forming of the stitches and the CllSpQSeCl laterally 011 a Spui gear 4 rotated production of a Seam running in true zigzag continually by means of' the driving shaft 5 fashion. Moreover, to keep the needle and and the PllOIl 6 the looper constantly in correct'working po- The gIOOVG 3 1S engaged by the roll 8 ot a 10 Siton relative to one another, additional m0- bell crank 7, the roll oscillating about a lined 6o tion is imparted tothe looper byajoint swing- Pm 9 and the bell Crank IIlOVlHg th@ needle ing about the needle lever so that the stitchbalaflm 1 0 CODlIlually t0 and f ro laterally forming members always cooperate in the fllllllg sewlllgbymeens 0f ellelelm llli saine position notwithstanding their lateral v Slmultelleellely elle lOePel 2 1S ellepleeeel l5 displacement. The devices hitherto employed letelelly else lOy elle eem gleeye 3 el elle @elle 65 to attain this endare comparatively complex elelll Wlllell heee l'ellwel'elly Pleleellll" and require numerous as well as unsuitable erm l2 eelmeeted Wltll a bell 301m 13 Wlllell transmission and control members not desirlll tern 1S flytlClllated t0 alevei 14. The lever able in high Speed machines es Vibration of 14 is positioned in the rear, on a cross shaft the moving parte is Caused thereby l 15 carrying in liront a Asecond lever 16 which 7 0 'Compared with the present state of the art le Plyetellyeelllleeted Home 17 t0 e bell the invention is distinguished chiefly by siiii- Creek 18 0l' 'elle llle Wlllell Cell lee moved about' plicity of design, i. e., by the small number e lem 19 amlle Connected' Wleh elle lOWel end of parts used, which results in increased work- 2O el the usuel lleeflle level 21p Mel'eeyel, ley

ing speed Without reduction insafety or, in means O f a ,SPllelflCal eemleeelell 22 lt le m 7a other Words in greater Output While faehtae communication with the connecting rod 23er ino. also the Production of the device the looper 2 so that the latter, together with ccordng to the invention, these adm the needle l, produces the seam in the known tages are attained by causing the cam groove mlannerl an@ llotlllo are Slmultaneollsly Clls 3 displacing the needle and the looper laterally P me@ ate/1.3.57 y the Cam groove 3v me 80 in the known manner to adjust the looper by working positions of the needle l and looper means of a double-armed lever positioned at 2 relatlve to one another bglug always the the needle-lever. A sale'l The invention is illustrated by way of eX- ALC im? t.t 1 1 t1 8: ample in the accompanying drawing, in which L C am S l 531 Sewmg mac lle 0 .lZlge J Fivure 1 is a front view of the sewing ina- Zag1type havlng a @am for llsplacmg .the Chiche; .Fig 2 3 top View thereof; Fig 3 a iieeoleaiid looper laterally during operation., section of the looper drive; Fig. 4, a sectional Compnsmg m combmatlon a douillearmed needle lever one of the arms of said needle side view of the driving end of the machine, 1 b 1 t. 1 1 l v o' and Figs. 5 and 6 are,'respectively, a top and @Vel @mg re a We y Ong. am 9*"te11dmg side view of the device adjusting the loooer' downwardly the fulcrum pwof of the needle Literally Y e llever being near the top of said arm, means tovoscillate said needle lever, a drive cani, lhe sewing machine according to the int means actuated by said camto cause lateral vention is operated in the manner usual foi' displacement of the needle, a second lever @l5 chain stitch machines ofthe zigzag type, that having two arms extending upwardly and le elle etllell'lefmmg members ell-ell es elle having its fulcrum pivot carried by the lower needle l elle the lOOPeT 2 ere Contmllelly elle end ofthe depending arm oi? the. needle lever, placed laterally to and fro during the sewing a louper, a connecting rod for the saine, one

5e step. The drive of the stitch-forming meniend of said connecting rod being pivotally we connected to one end of said second lever, and means actuated by the cam and operating the other end of said second lever, whereby the said second lever is osellated with respect to the needle lever While simultaneously the needle lever itself osellates the fulerum of the said second lever.

In testimony whereof I alX my Signature.

FRITZ EBERT. 

